I would suggest to look on Craigslist where they post garage sales. A lot of people are getting rid of just the metal frames for super cheap. Definitely snatch it up because you can buy comfortable futon mattresses that are designed to fit it! I would NOT recommend to buy a used mattress topper because of the bed bug outbreak that is happening in the US right now! You never know where that mattress has been or what has been spilled/soiled on it, ick.
If you are a woodworker or know someone who is good with that kind of thing, consider building your own frame. There are many great tutorials online that you can follow, all you need to do is get the sizes and then go to your local home depot/lowes to find some cheap quality wood. I think it’s really cool when people build their own pull out futon!
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